Fig. 4: Optical properties of brownmillerite and reduced SFCO films. | Nature Communications

Fig. 4: Optical properties of brownmillerite and reduced SFCO films.

From: Selective reduction in epitaxial SrFe0.5Co0.5O2.5 and its reversibility

Fig. 4: Optical properties of brownmillerite and reduced SFCO films.The alternative text for this image may have been generated using AI.

a Optical conductivity spectra of SrFe1−xCoxO2.5 films (x = 0, 0.2, 0.5, and 1.0), showing composition-dependent absorption features. b Optical conductivity spectra of SrFe0.5Co0.5O2.5 before and after reduction, highlighting spectral weight suppression and bandgap widening from 2.47 eV to 3.04 eV. Inset: photographs of as-grown (dark and opaque) and reduced (lighter and partially transparent) films on SrTiO3, visually confirming enhanced transparency upon reduction.

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